#!/usr/bin/env python

# Copyright (c) 2009, Purdue University
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"""list dns servers and dns server sets for roster"""


__copyright__ = 'Copyright (C) 2009, Purdue University'
__license__ = 'BSD'
__version__ = '0.17'


import sys

from roster_user_tools import cli_common_lib
from roster_user_tools import roster_client_lib
from roster_user_tools.action_flags import List
from roster_user_tools.data_flags import DnsServer


class Args(List, DnsServer):
  pass

def main(args):
  """Collects command line arguments.

  Inputs:
    args: list of arguments from the command line
  """
  command = None
  if( args and not args[0].startswith('-') ):
    command = args.pop(0)
  usage = ('\n'
           '\n'
           'To list a dns server:\n'
           '\t%s dns_server [-d <dns-server>]\n'
           '\n'
           'To list a dns server set:\n'
           '\t%s dns_server_set [-e <dns-server-set>]\n'
           '\n'
           'To list a dns server set assignment:\n'
           '\t%s assignment [-d <dns-server>] [-e <dns-server-set>]\n' % tuple(
               [sys.argv[0] for _ in range(3)]))
  args_instance = Args(command, ['dns_server', 'dns_server_set', 'assignment'],
                       args, usage)
  options = args_instance.options

  try:
    cli_common_lib_instance = cli_common_lib.CliCommonLib(options)
  except cli_common_lib.ArgumentError, error:
    print 'ERROR: %s' % error
    sys.exit(1)

  if( command == 'assignment' ):
    dns_servers = roster_client_lib.RunFunction(
        u'ListDnsServerSetAssignments', options.username,
        credfile=options.credfile, credstring=options.credstring,
        server_name=options.server,
        kwargs={'dns_server_name': options.dns_server,
                'dns_server_set_name': options.dns_server_set})['core_return']
    print_list = []
    if( not options.no_header ):
      print_list = [['set', 'dns_servers']]
    for dns_server_set in dns_servers:
      print_list.append([dns_server_set, ','.join(dns_servers[dns_server_set])])

  elif( command == 'dns_server' ):
    dns_servers = roster_client_lib.RunFunction(
        u'ListDnsServers', options.username,
        credfile=options.credfile, credstring=options.credstring,
        server_name=options.server,
        kwargs={'dns_server_name': options.dns_server})['core_return']
    print_list = []
    if( not options.no_header ):
      print_list = [['dns_server']]
    for dns_server in dns_servers:
      print_list.append([dns_server])

  elif( command == 'dns_server_set' ):
    dns_server_sets = roster_client_lib.RunFunction(
        u'ListDnsServerSets', options.username,
        credfile=options.credfile, credstring=options.credstring,
        server_name=options.server,
        kwargs={'dns_server_set_name': options.dns_server_set})['core_return']
    print_list = []
    if( not options.no_header ):
      print_list = [['dns_server_set']]
    for dns_server_set in dns_server_sets:
      print_list.append([dns_server_set])

  else:
    cli_common_lib.DnsError(
        'Command %s exists, but codepath doesn\'t.' % command, 1)

  print cli_common_lib.PrintColumns(print_list,
                                    first_line_header=(not options.no_header))

if __name__ == "__main__":
  main(sys.argv[1:])
